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Glowing pebbles, aka phosphorescent plankton. A natural luminescent stone. Place under a light or in the sunlight to "charge" the pebble and put it in a dark space. It will glow for hours.
Yttrium, #39 on the atomic scale. Rare Earth element. Origin is South Africia.
Tested at Zhong Jjian Kuang Jade Jewelry Appraiser Center. Lianyungang, Jiangsu, China.
Also tested for radioactivity by the University of Cincinnati Geology Dept using the thermoluminescent dosimeter and found not to be radioactive. The luminescence is from an organic structure locked into the stone, believed to be phosphorescent plankton.